<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .p1{
            width: 300px;
            height: 600px;
        }
        .calculator{
            display: flex;
            flex-wrap: wrap;
            align-content: space-between;
            width: 100%;
            height: 100%;
        }
        .calculator td div{
            border-radius: 50%;
            text-align: center;
            line-height: 60px;
            font-weight: bold;
            border: #727272 solid 1px;
            width: 60px;
            height: 60px;
            background-color: #cecece;
        }
    </style>
</head>
<body>
<div class="p1">
    <p>算式：</p>
    <hr >
    <p>结果：</p>
    <hr>
    <table class="calculator">
        <tr>
            <td><div>C</div></td>
            <td><div>CE</div></td>
            <td><div></div></td>
            <td><div></div></td>
        </tr>
        <tr>
            <td><div>1</div></td>
            <td><div>2</div></td>
            <td><div>3</div></td>
            <td><div>+</div></td>
        </tr>
        <tr>
            <td><div>4</div></td>
            <td><div>5</div></td>
            <td><div>6</div></td>
            <td><div>-</div></td>
        </tr>
        <tr>
            <td><div>7</div></td>
            <td><div>8</div></td>
            <td><div>9</div></td>
            <td><div>*</div></td>
        </tr>
        <tr>
            <td><div>/</div></td>
            <td><div>0</div></td>
            <td><div>.</div></td>
            <td><div>=</div></td>
        </tr>
    </table>
</div>
</body>
</html>